Ordnance  Pamphlet  No.  293 


"V^-Crvv 


AL<a-^q-a^s $ j&_ 


<f\    /..  J^v^j  ^M\- 


12 -INCH  RANGE  TABLE 


2,700  F.  S.  INITIAL  YELOCITY  TO  22,000  YARDS 

LONG  POINTED  PROJECTILE  COEFFICIENT  OF  FORM  .61 
WEIGHT  OF  PROJECTILE,  870  POUNDS 


SIACCI'S  METHOD 

CORRECTED  FOR  ALTITUDE 

INGALLS'S  BALLISTIC  TABLES 


OCTOBER,    1909 


WASHINGTON  :  GOVERNMENT  PRINTING  OFFICE  :  1909 


6 

w^ 


6° 


■>, 


o\ 


EXPLANATORY  NOTES. 

This  table  is  calculated  for  a  temperature  of  the  atmosphere  of  59°  F.,  and  a  barometric 
pressure  of  29.53  inches,  the  air  being  assumed  to  be  half  saturated.  The  powder  is  assumed 
to  give  normal  velocity  when  at  90°  F. 

Ingalls's  ballistic  tables  have  been  used  for  computing  columns  2,  3,  4,  5,  6,  8,  10,  11,  12,  as 
well  as  for  computing  the  altitude  factor  in  the  ballistic  coefficient. 

Alger's  formulas  were  used  for  computing  columns  7,  13,  14,  15,  16,  17,  18,  19. 

Davis's  formula  (formula  given  in  Fullam  and  Hart)  was  used  for  computing  column  9. 

Computations  were  made  for  every  500  yards  and  the  columns  completed  by  interpolation. 

Columns  1-5,  7,  8  need  no  explanation. 

Column  0  gives  the  total  drift  in  yards,  computed  by  Mayevski's  formula,  multiplied  by  1.5. 

Column  9  gives  penetration  of  Harveyized  armor.  To  get  penetration  of  Krupp  armor, 
multiply  figures  given  by  TV 

To  get  change  of  range  for  variation  of  ±  10  F.  S.  I.  V.,  multiply  figures  given  by  i. 

To  get  change  of  range  for  variation  of  1  per  cent  in  density  of  air,  multiply  figures  given 
by  ,V  The  density  of  the  air  is  assumed  to  be  unity  at  59°  F.  and  29.53  inches  barometric 
height.  The  density  of  the  air  for  any  temperature  and  barometric  height  is  given  in  Table  II, 
Alger's  exterior  ballistics.  This  column  also  represents  the  effect  on  the  range  of  a  variation 
of  ±10  per  cent  in  the  ballistic  coefficient,  I.V.  remaining  the  same. 

Column  11  gives  the  change  of  range  for  a  variation  of  ±  10  pounds  in  weight  of  projectile, 
the,  charge  remaining  the  same. 

For  a  variation  of  1  pound,  multiply  figures  in  column  11  by  i'ff- 

In  columns  13-18,  a  wind  of  24  knots  makes  twice  the  effect  tabulated. 

Column  19  shows  how  much  the  point  of  impact  is  raised  or  lowered  on  a  vertical  screen 
by  raising  or  lowering  the  sight  bar  100  yards,  the  actual  range  remaining  fixed. 

The  change  in  range  due  to  a  variation  6t±¥  in  the  angle  of  departure  may  be  deduced 
directly  from  the  table. 

For  a  variation  of   ±10°  F.  in  temperature  of  powder,  there  is  caused  a  corresponding 
change  in  the  initial  velocity  of  35  feet  per  second  approximately. 
10391—09 1 


RANGE^ABLE  FOR  12-INCH    GUN. 

Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2 ,700  foot-seconds. 

Coefficient  of  form  =  .61 . 


Range. 

Angle  of  depar- 
ture =  angle  of 
elevation  plus 
jump. 

Angle  of  fall. 

Time  of  flight. 

! 

Striking 
velocity. 

Drift. 

Danger 
space  for 
a  target  20 
feet  high. 

Maximum 
ordinate. 

Penetration 
ofharveyized 
armor  with 
capped  pro- 
jectiles. 

Change  of    1 
range  for     j 
variation  of 
±  50  foot- 
seconds  initial 
velocity. 

1 

2 

3 

4 

S 

6 

7 

8 

9 

10 

Yards. 

0                                        / 

. 

Seconds. 

Foot-seconds. 

2,700 
2,690 

Yards. 

Yards. 

100 

Feet. 

Inches. 

24.3 
24.1 

Yards. 

7 

100 

2.3 

2 

.11 

200 

4.7 

5 

.22  ' 

2,681 

200 

24.0 

13 

300 

7.0 

7 

.33 

2,671 

300 

23.9 

18 

400 

9.4 

10 

.44 

2,662 

400 

23.8 

22 

500 

11.7 

12 

.56 

2,652 

500 

23.7 

25 

600 

14.0 

14 

.67 

2,  643 



600 

1 

23.6 

28 

700 

16.4 

17 

.79 

2,633 

700 

2 

23.5 

31 

800 

IS.  7 

19 

.90 

2,624 



800 

3 

23.4 

33  ; 

900 

21.1 

22 

1.02 

2,615 



900 

4 

23.3 

36 

1,000 

23.4 

24 

1.13 

2,606 

0.5 

1,000 

5 

23.2 

39  ; 

1,100 

25.8 

27 

1.25 

2,596 

.6 

1,100 

6 

23.  1 

42 

1,200 

28.2 

29 

1.36 

2,587 

.6 

1,200 

7 

23.0 

45 

1,300 

30.6 

32 

1.48 

2,578 

.7 

1,300 

8 

22.9 

47 

1,400 

33.0 

*    34 

1.59 

2,569 

.7 

1,400 

9 

22.8 

50 

1,500 

35.4 

37 

1.71 

2,560 

.8 

1,500 

11 

22.7 

53 

RANGE  TABLE  FOR   12-INCH   GUN. 


Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2,700  foot-seconds. 
ijt/>  Coefficient  of  form  =  .61 . 


Change  of 

range  for 

variation  of 

±  10  pounds 

in  weight  of 

projectile. 

Change  of 
range  for 
variation  of 
density  of 
air  of  ±  10 
per  cent. 

Change  of 
range  for 
wind  com- 
ponent in 
plane  of  lire 
of  12  knots. 

Change  of 

range  for 

motion  of 

gun  in  plane 

of  fire  of  12 

knots. 

Change  of 
range  for 
motion  of 
target  in 
plane  of  fire 
of  12  knots. 

Deviation 
for  lateral 
wind  com- 
ponent of  12 
knots. 

Deviation 
for  lateral 
motion  of 
gun  per- 
pendicular 
to  line  of  fire, 
speed  of  12 
knots. 

Deviation 
for  lateral 
motion  of 
target  per- 
pendicular 
to  line  of  fire, 
speed  of  12 
knots. 

Change  in 

height  of 

impact  for 

variation  of 

±  100  yards 

in  sight  bar. 

11 

12 

13 

14 

15 

16 

17 

18 

19 

20 

Yards. 

Yards. 

Yards. 

Yards. 

Yards. 

Yards. 

Yards. 

Yards. 

Feet. 

1 

2 
3 

i 

1 

2 

1 
1 

2 



l 

2 

1 

1 

2 

4 
5 

2 
3 

2 
3 

2 
3 

2 
3 

1 

6 
6 

7 



4 

5 

5 

4 
5 
5 

4 
5 
5 

4 
5 
5 

1 

7 

6 

6 

6 

6 

1 

8 

2 

7 

7 

7 

7 

2 

9 

3 

8 

8 

8 

8 

2 

9 

4 

9 

9 

9 

9 

2 

10 

5 

9 

9 



9 

9 

2 

10 

6 

10 

10 

10 

10 

2 

11 

7 

11 

11 

11 

11 

3 

o  a  rr  t\c%i\ 


RANGE  TABLE  FOR  12-INCH  GUN. 


Weight  of 'projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2,700  foot-seconds. 

Coefficient  of  form  =  .61. 


Range. 

Angle  of  depar- 
ture =  angle  of 
elevation  plus 
jump. 

Angle  of  fall. 

Time  of  flight. 

Striving 
velocity. 

Drift. 

Danger 
space  for 
a  tarcet  20 
feet  high. 

Maximum 
ordinate. 

Penetration 
ofharveyized 
armor  with 
capped  pro- 
jectiles. 

Change  of 
range  for 

variation  of 
±  50  foot- 
seconds  initial 
velocity. 

* 

„ 

3 

4 

5 

6 

7 

8 

9 

10 

Yards. 

. 

Seconds. 

Foot-seconds. 

Yards. 

Yards. 

Feet. 

Inches. 

Yards. 

1,500 

35.4 

37 

1.71 

2,560 

.8 

1,500 

n 

22.7 

53 

1,600 

37.8 

40 

1.83 

2,550 

.9 

1,600 

13 

22.6 

56 

1,700 

40.3 

42 

1.95 

,  2,  541 

.9 

1,700 

15 

22.5 

59 

1,800 

42.8 

45 

2.07 

2,532 

1.0 

1,800 

17 

22.4 

61 

1,900 

45.3 

47 

2.19 

2,523 

1.0 

1,900 

19 

22.3 

64 

2,  000 

47.8 

50 

2.31 

2,514 

1.1 

564 

21 

22.  2 

67 

2,  100 

50.3 

52 

2.43 

2,505 

1.1 

527 

23 

22.  1 

70 

2,  200 

52.9 

55 

2.55 

2,496 

1.2 

493 

25 

22.0 

73: 

2,300 

55.4 

58 

2.67 

2,487 

1.3 

462 

27 

21.9 

76 

2,400 

58.0 

1     01 

2.79 

2,478 

1.4 

434 

30 

21.8 

79 

2,500 

1     00.5 

1     04 

2.91 

2,469 

1.5 

409 

33 

21.7 

82 

2,600 

1     03.1 

1     07 

3.03 

2,460 

1.6 

387 

36 

21.6 

85 

2,700 

1     05.6 

1     10 

3.15 

2,451 

1.7 

367 

39 

21.5 

88 

2,800 

1     08.2 

1      13 

3.27 

2,442 

1.8 

349 

42 

21.4 

91 

2,  900 

1     10.8 

1     16 

3.39 

2,433 

1.9 

333 

45 

21.3 

94 

3,  000 

1     13.4 

1     19 

3.52 

2,424 

2.0 

318 

48 

21.2 

97 

RANGE  TABLE  FOR  12-INCH   GUN. 


'  Waight  of  projectile  for  which  this  table  is  cilculzted,  870  pounds.     Initial  velocity,  2 ,700 foot-seconds . 

Coefficient  of  form  =  .61. 


Change  of 

range  for 

variation  of 

±  10  pounds 

in  weight  of 

projectile. 


Yards. 


11 

12 
12 
13 
13 
14 

14 
15 
15 
16 
16 

17 
17 
18 
18 
19 


Change  of 
range  for 
variation  of 
density  of 
air  of  ±  10 
per  cent. 


Yards. 

7 

8 

9 

10 

11 

12 

13 
14 
15 
16 
17 

18 
19 
20 
21 
22 


Change  of 
range  for 
wind  com- 
ponent in 
plane  of  fire 
of  12  knots. 


13 


Yards. 


Change  of 
range  for 
motion  of 
gnn  in  plane 
of  Are  of  12 
knots. 


14 


Change  of 
range  for 
motion  of 


Deviation 
for  lateral 
wind  com- 


planToVfirelP-l^^ 
of  12  knots. 


knots. 


15 


Fords. 
11 

12 
12 
13 
13 
14 

15 
15 
16 
16 

17 

18 
19 
19 
20 
21 


Yards. 
11 

12 
13 
13 
14 
15 

16 
17 
17 
18 
19 

.20 
21 
21 
22 
23 


16 


Yards. 


Deviation 
for  lateral 
motion  of 
gun  per- 
pendicular 


Deviation 
for  lateral 
motion  of 
target  per- 
pen  lieular 


to  line  of  fire,  \  to  line  of  fire. 

speed  of  12    '   speed  of  12 

knots.  knots. 


18 


Yards. 
11 

12 
13 
13 
14 
15 

16 
17 
17 
18 
19 

20 
20 
21 
21 
22 


Yards. 
11 

12 
13 
13 
14 
15 

16 
17 
17 
18 
19 

20 
21 
21 

22 
23 


Change  in 
height  of 
impact  for 
variation  of 
±  100  yards 
in  sight  bar. 


19 


Feet. 


10391—09- 


RANGE  TABLE  FOR   12-INCH   GUN. 


Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.  .  Initial  velocity,  2, 7  00  foot-seconds. 

Coefficient  of  form  =  .61 . 


Range. 

Angle  oi  depar- 
ture =  angle  of 
elevation  plus 
jump. 

Angle  of  fall. 

rime  of  flight. 

Striking 
velocity. 

Drift. 

Danger 
space  for    ; 
a  target  20  ! 
feet  high.   \ 

Maximum 
ordinate. 

Penetration 
ofharveyized 
armor  with 
capped  pro-   < 
jectiles. 

Change  of 

ranee  for 
variation  of 

±  50  foot- 
econds  initial 

velocity. 

1 

2 

3 

4 

i 

5 

6 

7 

8 

9 

10 

Yards. 

• 

' 

• 

' 

Seconds. 

Foot-seconds. 

Yards. 

Yards. 

Feet. 

Inches. 

Yards. 

3,000 

1 

13.4 

1 

19 

3.52  i 

2,424 

2.0 

318 

48 

21.2 

97 

3,100 

1 

16.0 

1 

22 

3.64 

2,415 

2.1 

304    ; 

52 

21.1 

100 

3,200 

1 

18.6 

1 

25 

3.77 

2,406 

2.3 

291 

56 

21.0 

103 

3,300  i 

1 

21.2 

1 

28 

3.89 

2,397 

2.4 

279  ; 

60 

20.9 

106 

3, 400 

1 

23.9 

1 

31 

4.02 

2,388 

2.6 

269 

64 

20.8 

109 

3,500 

1 

26.6 

1 

34 

4.14 

2,380 

2.7 

260 

68 

20.7 

112 

3,600 

1 

29.3 

1 

37 

4.27 

2,371 

2.9 

251 

72 

20.6 

115 

3,700 

1 

32.0 

1 

40 

4.39 

2,363 

3.0 

242 

76 

20.5 

118 

3,800 

1 

34.7 

1 

43 

4.52 

2,354 

3.2 

234 

81 

20.4 

121 

3,  900 

1 

37.4 

1 

46 

4.64 

2,346 

3.4 

226 

86 

20.3 

124 

4,000 

1 

40.2 

1 

50 

4.77 

2,337 

3.6 

219 

91 

20.2 

127 

4,100 

1 

43.0 

1 

53 

4.90 

2,329 

3.8 

212 

96 

20.1 

130 

4,200 

1 

45.8 

1 

57 

5.03 

2,320 

4.0 

206 

101 

20.0 

133 

4,300 

1 

48.6 

2 

00 

5.16 

2,312 

4.2 

200 

106 

19.9 

136 

4,400 

1 

51.4 

2 

04 

5.29 

2,303 

4.5 

194 

112 

19.8 

139 

4,500 

1 

54.2 

2 

07 

5.42 

2,295 

4.7 

188 

118 

19.8 

142 

RANGE  TABLE  FOR  12-INCH  GUN. 


Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2, 7 '00  foot-seconds. 

Coefficient  of  form  =  .61 . 


Change  of 

ranee  for 

variation  of 

±  10  pounds 

in  weight  of 

projectile. 


11 


Yards. 

19 

20 
20 
21 
21 
22 

23 
23 
24 
24 
25 

25 
26 
26 

27 

27 


Change  of 
range  for 
variation  of 
density  of 
air  of  ±  10 
per  cent. 


12 


Change  of 
range  for 
wind  com- 
ponent in 
plane  of  fire 
of  12  knots. 


Yards. 

22 

23 

24 
26 

27 
28 

29 
31 
32 
34 
35 

37 
39 
40 
42 
44 


Yards. 


Change  of 
range  for 
motion  of 
gun  in  plane 
of  fire  of  12 
knots. 


14 


Yards. 

21 

22 
22 
23 
23 
24 

25 

25 
26 
26 
27 

28 
28 
29 
29 
30 


Change  of 
range  for 
motion  of 
target  in 
plane  of  fire 
of  12  knots. 


15 


Yards. 

23 

24 
25 
25 
26 

27 

28 
29 
30 
31 
32 

33 
34 
'34 
35 
36 


Deviation 
for  lateral 
wind  com- 
ponent of  12 
knots. 


16 


Yards. 


Deviation 
for  lateral 
motion  of 
gun  per- 
pendicular 
to  line  of  fire, 
speed  of  12 
knots. 

17 


Deviation 
for  lateral 
motion  of 
target  per- 
pendicular 
to  line  of  fire, 
speed  of  12 
knots. 

18 


Yards. 

22 

23 

24 
24 
25 
26 

27 
28 
28 
29 
30 

31 
31 
32 
32 
33 


Yards. 

23 

24 
25 
25 
26 

27 

28 
29 
30 
31 
32 

33 
34 
34 
35 
36 


Change  in 
height  of 
impact  for 
variation  of 
±  100  yards 
in  sight  bar. 


Feet. 


6 

7 
7 
7 
8 

8 
8 
8 
8 
9 

9 
10 
10 
10 
11 


RANGE  TABLE  FOR  12-INCH  GUN. 

Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2,700  foot-seconds. 

Coefficient  of  form  =  .61 . 


Range. 

Angle  of  depar- 
ture =angle  of 
elevation  plus 
jump. 

Angle  of  fall, 
i 

Time  of  flight. 

Striking 
velocity. 

Drift. 

Danger 
space  for 
a  target  20 
feet  high. 

Maximum 
ordinate. 

Penetration 
ofharveyized 
armor  with 
capped  pro- 
jectiles. 

Change  of 
range  for 
variation  of 
±  50  foot- 
seconds  initial 
velocity. 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

Yards. 

» 

' 

• 

' 

Seconds. 

Foot-seconds. 

Yards. 

Yards. 

Feet. 

Inches. 

Yards. 

4,  500 

1 

54.2 

2 

07 

5.42 

2,295 

4.7 

188 

118 

19.8 

142  1 

4,600 

1 

57.0 

2 

10 

5.55 

2,286 

5.0 

182 

124 

19.7 

145 

4,700 

1 

59.9 

2 

14 

5.68 

2,278 

5.2 

177 

130 

19.6 

148 

4,800 

2 

02.8 

2 

18 

5.81 

2,270 

5.5 

• 

172 

136 

19.5 

151 

4,900 

2 

05.7 

2 

21 

5.95 

2,262 

5.7 

167 

142 

19.4 

154 

5,000 

2 

08.6 

2 

25 

6.08 

2,254 

6.0 

162 

149 

19.4 

157 

5,100 

2 

11.5 

2 

28 

6.22 

2,245 

6.2 

158 

156 

19.3 

160 

5,200 

2 

14.4 

2 

32 

6.35 

2,237 

6.5 

154 

;63 

19.2 

163 

5,300 

2 

17.4 

2 

36 

6.49 

2,229 

6.8 

150 

170 

19.1 

166 

5,400 

2 

20.4 

2 

40 

6.62 

2,221 

7.1 

147 

177 

19.0 

169 

5,500 

2 

23.4 

2 

44 

6.76 

2,213 

7.4 

143 

184 

18.9 

172 

5,600 

2 

26.4 

2 

48 

6.89 

2,205 

7.7 

140 

191 

18.8 

175 

5,700 

2 

29.4 

2 

52 

7.03 

2,197 

8.1 

137 

199 

18.7 

178 

5,800 

2 

32.4 

2 

56 

7.17 

2,189 

8.4 

133 

207 

18.6 

180 

5,900 

2 

35.4 

3 

00 

7.31 

2,181 

8.8 

130 

215 

18.5 

183 

6,000 

2 

38.5 

3 

04 

7.45 

2,173 

9.1 

127 

223 

18.5 

186 

RANGE  TABLE  FOR   12-INCH   GUN. 


Wright  of  projectile  for  which  this  table  is  calculate!,  870  pounis.    Initial  velocity,  2 ,700  foot-seconds . 

Coefficient  of  form  =  .61. 


Change  of 

range  for 

variation  of 

±  10  pounds 

in  weight  of 

projectile. 


11 

Yards. 

27 

27 
28 
28 
29 
29 


Change  of 
range  for 
variation  of 
density  of 
air  of  ±  10 
per  cent. 


12 


Change  of 
range  for 
wind  com- 
ponent in 
plane  of  fire 
of  12  knots. 


Yards. 
44 

46 
48 
51 
53 
55 


Yards. 


6 

6 
6 

6 
6 

7 


Change  of 

range  for 

motion  of 

gun  in  plane 

of  fire  of  12 

knots. 


14 


Change  of 
range  for 
motion  of 
target  in 
plane  of  fire 
of  12  knots. 


15 


Deviation 
for  lateral 
motion  of 
gun  per- 


Deviation 
for  lateral 
wind  com- 


Yards. 

30 

31 
31 
32 
32 
33 


knots. 


16 


Yards. 

36 

37 
38 
39 
40 
41 


Ford*. 


speed  of  12 
knots. 


17 


Yards. 


33 

34 
35 
35 
36 
37 


Deviation 
for  lateral 
motion  of 
target  per- 
pendicular 
to  line  of  fire, 
speed  of  12 
knots. 

18 


Change  in 

I     height  of 

Impact  for 

i  variation  of 

±100  yards 

in  sight  bar. 


19 


Yards. 

36 

37 
38 
39 
40 
41 


Feet. 


11 

11 
11 

12 
12 
12 


20 


29 
30 
30 
31 
31 


57 
60 
62 
65 
67 


34 
34 
35 
35 
36 


42 
43 
43 
44 
45 


38 
39 
39 
40 
41 


42 
43 
43 

44 
45 


12 
13 
13 
14 
14 


31 
32 
32 
33 
33 


70 

72 
75 

77 
80 


8 

9 

9 

10 

10 


37 
37 

38 
38 
39 


46 
47 
48 
49 
50 


42 
43 
43 
44 
45 


46 

47 
48 
49 
50 


14 
15 
15 
16 
16 


10391—09- 


10 


RANGE  TABLE  FOR  12-INCH   GUN. 


Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds. .    Initial  velocity,  2, 7  00  foot-seconds . 

Coefficient  of  form  =  .61 . 


Range. 

Angle  of  depar-  ' 

ture=  angle  of 

elevation  plus 

jump. 

Angle  of  fall. 

Time  of  flight. 

Striking 
velocity. 

Drift. 

Danger 
space  for 
a  target  20 
feet  high. 

Maximum 
ordinate. 

Penetration 
of  harveyized 
armor  with 
capped  pro- 
jectiles. 

Change  of 
range  for 
variation  of 
±  50  foot- 
seconds  initial 
velocity. 

1 

* 

i 

4 

5 

6 

7 

8 

9 

10 

Yards. 

• 

' 

° 

' 

Seconds. 

Foot-seconds. 

Yards. 

Yards. 

Feet. 

Inches. 

Yards. 

6,000 

2 

38.5 

3 

04 

7.45 

2,173 

9.1 

127 

223 

18.5 

186  ! 

6,100 

2 

41.6 

3 

08 

7.59 

2,165 

9.5 

124 

231 

18.4 

189 

6,  200 

2 

44.7 

3 

12 

7.73 

2,157 

9.8 

122 

240 

18.3 

192 

6,300 

2 

47.8 

3 

16 

7.87 

2,149 

10.2 

119 

249 

18.2 

194 

6,  400 

2 

50.9 

3 

20 

8.01 

2,141 

10.6 

117 

258 

18.1 

197 

6,500 

2 

54.0 

3 

24 

8.15 

2,133 

11.0 

114 

267 

18.1 

200 

6,600 

2 

57.1 

3 

28 

8.29 

2,125 

11.4 

112 

276 

18.0 

203  i 

6,700 

3 

00.3 

3 

32 

8.43 

2,117 

11.9 

110 

286 

17.9 

206 

6,800 

3 

03.  5 

3 

36 

8.57 

2,109 

12.3 

107 

296 

17.8 

208 

6,  900 

3 

06.7 

3 

40 

8.72 

2,101 

12.8 

105 

306 

17.7 

211 

7,000 

3 

09.9 

3 

45 

8.86 

2,094 

13.2 

103 

316 

17.7 

214 

7,100 

3 

13.1 

3 

49 

9.01 

2,086 

13.7 

101 

326 

17.6 

217 

7,200 

3 

16.3 

3 

54 

9.15 

2,079 

14.1 

99 

337 

17.5 

220 

7,300 

3 

19.6 

3 

58 

9.30 

2,071 

14.6 

98 

348 

17.4 

222 

7,400 

3 

22.9 

4 

03 

9.44 

2,064 

15.1 

96 

359 

17.3 

225 

7,500 

3 

26.2 

4 

07 

9.59 

2,056 

15.6 

94 

370 

17.3 

228 

11 


RANGE  TABLE  FOR  12-INCH  GUN. 

Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2, 7  00  foot-seconds. 

Coefficient  of  form  =  .61 . 


Change  of 
range  for 
variation  of 
t  10  pounds 
in  weight  of 
projectile. 


Change  of 
range  for 
variation  of 
density  of 
air  of  ±  10 
per  cent. 


12 


Yards. 


33 


35 
35 
36 
36 
36 

36 
37 
37 

38 
38 


Change  of 
range  for 
wind  com- 
ponent in 
plane  of  fire 
of  12  knots. 


13 


Yards. 


80 


33 

83 

10 

34 

86 

11 

34 

88 

11 

36 

91 

12 

35 

94 

12 

97 
100 
102 
105 
108 

111 
114 
117 
120 
123 


Yards. 


Change  of 
range  for 
motion  of 
gun  in  plane 
of  fire  of  12 
knots. 


14 


10 


12 
13 
13 

14 
14 

14 
15 
15 
16 
16 


Yards. 


39 

40 
40 
41 
41 
42 

43 
43 
44 
44 
45 

46 
46 
47 
47 

48 


Change  of 
range  for 
motion  of 
target  in 
plane  of  fire 
of  12  knots. 


15 


Deviation 
for  lateral 
wind  corn- 


Deviation 
for  lateral 
motion  of 
gun  per- 


ponento  12      Pedicular 
i-Vwvfo        i  to  line  of  f  re 


16 


re, 

speed  of  12 
knots. 

17 


Deviation 
for  lateral 
motion  of 
target  per- 
pendicular 
to  line  of  fire, 
speed  of  12 
knots. 

18 


Yards. 

50 

51 
52 
53 
54 
55 

56 
57 

58 
59 
60 

61 
62 
63 
64 
65 


Yards. 


Yards. 


45 

46 
46 

47 
47 
48 

49 
50 
50 
51 
52 

53 
54 
54 
55 
56 


Change  in 

height  of 

impact  for 

variation  of 

±  100  yards 

in  sight  bar. 


1» 


Yards. 

50 

51 
52 
53 
54 
55 

56 
57 

58 
59 
60 

61 
62 
63 
64 
65 


Feet. 


16 

16 
17 
17 
17 
18 

18 
18 
19 
19 
19 

19 
20 
20 
21 
21 


12 


RANGE  TABLE  FOR  12-INCH   GUN. 


Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds. .   Initial  velocity,  2,700  foot-seconds. 

Coefficient  of  form  =  .61 . 


Range. 

Angle  of  depar- 
ture =  angle  of 
elevation  plus 
jump. 

Angle  of  fall. 

Time  of  flight. 

Striking 
velocity. 

Drift. 

Danger 
space  for 
a  target  20 
feet  high. 

Maximum 
ordinate. 

Penetration 
ofharveyized 
armor  with 
capped  pro- 
jectiles. 

Change  of 
range  for 
variation  of 
±  50  foot- 
seconds  initial 
velocity. 

1 

2 

8 

4 

5 

6 

• 
7 

8 

9 

10 

Yards. 

• 

' 

• 

» 

Seconds. 

Foot-seconds. 

Yards. 

Yards. 

Feet. 

Inches. 

Yards. 

7,500 

3 

26.2 

4 

07 

9.59 

2,056 

15.6 

94 

370 

17.3 

228 

7,  600 

3 

29.5 

4 

12 

9.73 

2,048 

16.1 

92 

381 

17.2 

231 

7,700 

3 

32.8 

4 

16 

9.88 

2,  041 

16.7 

90 

393 

17.1 

233 

7,800 

3 

36.2 

4 

21 

10.03 

2,033 

17.2 

89 

405 

17.0 

236 

7,900 

3 

39.6 

4 

25 

10.18 

2,026 

17.8 

87 

417 

16.9 

238 

8,000 

3 

43.0 

4 

30 

10.33 

2,018 

18.3 

85 

429 

16.9 

241 

8,100 

3 

46.4 

4 

35 

10.48 

2,011 

18.9 

84 

442 

16.8 

244  i 

8,200 

3 

49.8 

4 

40 

10.63 

2,003 

19.4 

82 

455 

16.7 

246 

8,300 

3 

53.2 

4 

45 

10.78 

1,996 

20.0 

81 

468 

16.6 

249 

8,400 

3 

56.7 

4 

50 

10.93 

1,988 

20.6 

79 

481 

16.5 

251 

8,500 

4 

00.2 

4 

55 

11.09 

1,981 

21.2 

78 

494 

16.5 

254 

8,600 

4 

03.7 

5 

00 

11.24 

1,973 

21.8 

77 

508 

16.4 

256 

8,700 

4 

07.2  . 

5 

05 

11.40 

1,966 

22.5 

76 

522 

16.3 

259 

8,800 

4 

10.7 

5 

10 

11.55 

1,959 

23.1 

74 

536 

16.2 

261 

8,900 

4 

14.2 

5 

15 

11.71 

1,952 

23.8 

73 

550 

16.1 

264 

9,000 

4 

17.8 

5 

21 

11.86 

1,945 

24.4 

72 

565 

16.1 

266 

13 


RANGE  TABLE  FOR  12-INCH  GUN. 

Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2,700  foot-seconds. 

Coefficient  of  form  =  .61 . 


Change  of     ,    Change  of    j    Change  of    I    Change  of    '    Change  of        Deviation 

range  for      !     range  for  range  for     i     range  for     I     range  for         w  Hieril 

variation  of      variation  of      wind  com-    I    motion  of        motion  of    ' 


±  10  pounds       density  of        ponent  in    '  gun  in  plane  '      target  in 


wind  com- 


in  weight  of       air  of  ±  10    |  plane  of  fire  ;    of  fire  of  12    \  plane  of  fire  i  p  T.„„t° 


projectile. 
11 

Yards. 

38 

38 
38 
39 
39 
39 

39 
39 
39 
39 

39  ; 

39 
39  ; 
39 
39 
39 


per  cent.     I  of  12  knots. 


knots.      J  of  12  knots. 


12 


Yatds. 

123  i 

126  ! 
129 
133 
136  ! 
139 

142 
146 
149  \ 
153 
156  [ 

160 
164  | 
167 
171 
175 


13 

Yards. 

16 

16 
17 
17 
18 
18 

19 
19 
20 
20 
21 

22 
22 
23 
23 
24 


14 

Yards. 

48 

49 
49 
50 
50 
51 

51 
52 
52 
53 
53 

54 
54 
55 
55 
56 


15 


Yards. 

65 

66 
67 
68 
69 
70 

71 
72 
73 
74 
75 

76 

77 
78 
79 
80 


knots. 


16 


Yards. 


Deviation 
for  lateral 
motion  of 
gun  per- 
pendicular 
to  line  of  fire, 
speed  of  12 
knots. 

17 


8 
8 
8 
8 
9 

9 
9 
9 
9 
10 

10 
11 
11 
12 
12 


Yards. 

56 

57 
58 
58 
59 
60 

61 
61 
62 
62 
63 

64 
65 
65 
66 
67 


Deviation 
for  lateral 
motion  of 
target  per- 
pendicular 
to  line  of  fire, 
speed  of  12 
knots. 

18 


Yards. 

65 

66 
67 
68 
69 
70 

71 
72 
73 
74 
75 

76 

77 
78 
79 
80 


Change  in 

height  of 

impact  for 

variation  of 

±  100  yards 

in  sight  bar. 


19 


Feet. 


21 

21 
22 
22 
23 
23 

23 
24 
24 
25 
25 

26 
26 

27 
27 
28 


10391—09- 


14 


RANGE  TABLE  FOR   12-INCH  GUN. 

Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.   .  Initial  velocity,  2, 7  CO  f cot-secerns. 

Coefficient  of  form  =  .61 . 


Range. 


Angle  of  depar-  j 

tnre=  angle  of  :  A     ,      .  f  „ 

elevation  plus  I  Angle  0I  mu 
jump. 


Yards. 

9,000  j     4     17.8 


5     21 


Time  of  flight. 


Striking 
velocity. 


Seconds.       Foot-seconds. 

11.86  !     1,945 


Drift. 
6 

Danger 
space  for 
a  target  20 
feet  high. 

7 

Yards. 

24.4 

Yards. 
72 

Maximum 

ordinate. 


8 


Feet. 

565 


Penetration 
of  harveyized 
armor  with 
capped  pro- 
jectiles. 


!• 


Ivelif*. 

16.1 


Change  of 
range  for 
variation  of 
±  50  foot- 
seconds  initial 
velocity. 


10 


Yards. 

266 


9,100  j  4  21.4  I  5  26 

9,200  |  4  25.0  5  31 

9,300  |  4  28.6  5  36 

9,400  |  4  32.2  j  5  42 

9,500  j  4  35.9  j  5  47 


12.02  1,938  25.1  71  580  16.0 

12.17  1,931  |  25.7  70  595  '  15.9 

12.33  1,924  !  26.4  68  610  j  15.8 

12.48  1,917  27.1  ;    67  626  15.7 

12.64  1,910  27.8  66  642  15.7 


268 
271 
273 
276 

278 


9,600 

4 

39.6 

5 

53 

12.  79 

1,903 

28.6 

65 

658 

15.6 

280 

9,700 

4 

43.3 

5 

58 

12.95 

1,896 

29.3 

64 

674 

15.6 

282 

9,800 

4 

47.0 

6 

04 

13.11 

1,889 

30.1 

63 

691 

15.5 

285 

9,  900 

4 

50.  7 

6 

09 

13.27 

1,882 

30.8 

62 

708 

15.5 

287 

10, 000 

4 

54.4 

6 

15 

13.43 

1,876 

31.6 

61 

725 

15.4 

289 

10,  100 

4 

58.2 

6 

20 

13.59 

1,869 

32.4 

60 

743 

15.3 

291 

10,  200 

5 

02.0 

6 

26 

13.  75 

1,862 

33.2 

59 

761 

15.2 

293 

10, 300 

5 

05.8 

6 

32 

13.91 

1,855 

34.0 

59 

779 

15.1 

296 

10,  400 

5 

09.6 

6 

38 

14.07 

1,  848 

34.8 

58 

797 

15.0 

298 

10, 500 

5 

13.4 

6 

44 

14.24 

1,842 

35.6 

57 

815 

15.0 

300 

15 


RANGE  TABLE  FOR  12-INCH  GUN. 

Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2, 7  00  foot-seconds. 

Coefficient  of  form  —  .61 . 


Change  of  Change  of 

range  for  range  for 

variation  of  variation  of 

±  10  pounds  j    density  of 

in  weight  of  air  of  ±10 


projectile. 


yards. 


39 

39 
39 
40 
40 
40 


per  cent. 

12 

Yards. 

175 

179 
183 

187 
191 
195 


Change  of 
range  for 
win  J  com- 
ponent in 
plane  of  fire 
of  12  knots. 


IS 

Fords. 

24 


Change  of 

range  for 

motion  of 

gun  in  plane 

of  fire  of  12 

knots. 


14 


24 
25 
25 
26 
26 


Change  of 
range  for 
motion  of 
target  in 
plane  of  fire 
of  12  knots. 


15 


Yards. 

56 

57 
57 

58 
58 
59 


Deviation 
for  lateral 
win  :1  com- 
ponent of  12 
knots. 


16 


Yards. 

80 

81 

82 
83 
84 
85 


Yards. 

12 

12 
12 
12 
12 
13 


Deviation 
for  lateral 
motion  of 
gun  per- 
pendicular 
to  line  of  tire, 
speed  of  12 
knots. 

17 


Deviation 
for  lateral 
motion  of 
target  per- 
pendicular 
to  line  of  hre, 
speed  of  12 
knots. 

18 


Yards. 

67 

68 
69 
69 
70 
71 


Yards. 

80 

81 
82 
83 
84 
85 


Change  in 
height  of 
impact  for 
variation  of 
±  100  yards 
in  sight  nar. 


19 


Feet. 


28 
28 

29 
29 
30 
30 


20 


40 

199 

40 

203 

40 

208 

40 

212 

40 

216 

40 

220 

40 

225 

40 

229 

40 

234 

40 

238 

27 

59 

27 

60 

28 

60 

28 

61 

29 

61 

30 
30 
31 
31 
32 


61 
62 
62 
63 
63 


86 
87 
88 
89 
90 

91 
92 
93 
94 
96 


13 

14 
14 
15 
15 

15 
16 
16 
17 
17 


72 
73 
73 
74 
75 

76 

77 
77 
78 
79 


86 
87 
88 
89 
90 

91 
92 
93 
94 
96 


30 
31 
31 
32 
32 

33 
33 
34 
34 
35 


16 


RANGE  TABLE  FOR  12-INCH   GUN. 


Weight  of  projectile  for  which  this  table  is  calculated,  870  founds.     Initial  velocity,  2, 7  00  foot-seconds . 

Coefficient  of  form  =  .61 . 


Range. 

Angle  of  depar- 
ture = angle  of 
elevation  plus 
jump. 

Angle 

of  fall. 

Time  of  flight. 

Striking 
velocity. 

Drift. 

Danger 
space  for 
a  target  20 
feet  high. 

Maximum 
ordinate. 

Penetration 
ofharveyized 
armor  with 
cappel  pro- 
jectiles. 

Change  of 
range  for 
variation  of 
±  50  foot- 
seconds  initial 
velocity. 

1 

•2 

3 

i 

5 

6 

7 
Yards. 

8 

» 

10 

Yards. 

• 

' 

" 

' 

Secoiids. 

Foot-seconds. 

Yards. 

Feet. 

Inches. 

Yards. 

10,  500 

5 

13.4 

6 

44 

14.  24 

1,842 

35.6 

57 

815 

15.0 

300 

10,  600 

5 

17.3 

6 

50 

14.40 

1,835 

36.4 

56 

834 

14.9 

302 

10,  700 

5 

21.2 

6 

56 

14.57 

1,829 

37.3 

55 

853 

14.9 

304 

10,  800 

5 

25.1 

7 

02 

14.73 

1,822 

38.2 

55 

873 

14.8 

307 

10,  900 

5 

29.0 

7 

08 

14.90 

1,816 

39.1 

54 

893 

14.8 

309 

11,000 

5 

32.9 

7 

15 

15.06 

1,809 

40.0 

53 

913 

14.7 

311 

11,  100 

5 

36.9 

7 

21 

15.23 

1,803 

40.9 

52 

934 

14.6 

313 

11,200 

5 

40.9 

7 

27 

15.39 

1,796 

41.8 

51 

955 

14.6 

315 

11,300 

5 

44.9 

7 

33 

15.56 

1,790 

42.8 

51 

976 

14.5 

317 

11,400 

5 

48.9 

7 

40 

15.73 

1,783 

43.8 

50 

997 

14.5 

319 

11,500 

5 

52.9 

7 

46 

15.90 

1,777 

44.8 

49 

1,019 

14.4 

321 

11,600 

5 

57.0 

7 

53 

16.07 

1,770 

45.8 

48 

1,041 

14.3 

323 

11,700 

6 

01.1 

7 

59 

16.24 

1,764 

46.8 

48 

1,064 

14.3 

325 

11,800 

6 

05.2 

8 

06 

16.41 

1,758 

47.8 

47 

1,  087 

14.2 

327  i 

11,  900 

6 

09.3 

8 

12 

16.58 

1,752 

48.8 

47 

1,110 

14.2 

329 

12,  000 

6 

13.5 

8 

19 

16.76 

1,746 

49.9 

46 

1,133 

14.1 

331 

17 


RANGE  TABLE  FOR  12-INCH  GUN. 


Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2, 700 foot-seconds. 

Coefficient  of  form  =  .61 . 


Change  of 

range  for 

variation  of 

±  10  pounds 

in  weight  of 

projectile. 

11 


Yards. 


40 

40 
40 

40 
40 

41) 

40 
40 
40 
39 
39 


Change  of 
range  for 
variation  of 
density  of 
air  of  ±  10 
per  cent. 


12 

Yards. 

238 


Change  of  j    Change  of    |    Change  of 

range  for  :     range  for     ;     range  for  , 

wind  com-  motion  of        motion  of  i    witlfi  Pom 

ponent  in  gun  in  plane       target  in  j  non„nt  of  ,"2 

plane  of  fire  of  fire  of  12    i  plane  of  fire  l  p   v  "  t« 

of  12  knots.  knots.       '  of  12  knots.          KD0K>' 


Deviation 


Deviation 
for  lateral 
motion  of 
gun  per- 
pendicular 


Deviation 
for  lateral 
motion  of 
target  per- 
pendicular 


Change  in 

height  of 

impact  for 

variation  of 


to  line  of  tire,  [  to  line  of  fire,  \  ±  100  yards 


13 


242 
247 
251 
256 
260 

265 
269 

274 
278 
283 


39 

288 

39 

292 

39 

297 

39 

301 

39 

306 

Yards. 

32 


33 
33 
34 
34 
35 

36 
36  ' 
37 
37 

38  ! 

39 
40 
40 
41 
42 


14 


Yards. 

63 

64 
64 
65 
65 
66 

66 

67 
67 
68 
68 

68 
69 
69 
70 
70 


15 


Yards. 

96 

97 

98 

99 

100 

101 

102 
103 
104 
105 
107 

108 
109 
110 
111 
113 


16 

Fords. 

17 

17 
18 
18 
19 
19 

19 
19 
20 
20 
20 

20 
21 
21 
22 
22 


speed  of  12 
knots. 

17 


speed  of  12    i  in  sight  bar. 
knots. 


80 
80 
81 
81 

82 

83 
84 
84 
85 
86 

87 
88 
88 
89 
90 


18 


Yards.  Yards. 

79  96 


97 

98 

99 

100 

1.01 

102 

103 
104 
105 

107 

108 
109 
110 
111 
113 


19 


Feet. 


35 

36 
36 
37 
37 
38 

38 
39 
39 
40 
40 

41 
41 
42 
42 
43 


20 


18 

RANGE  TABLE  FOR  12-INCH  GUN. 

Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds. .    Initial  velocity,  £  ,700  foot-seconds 

Coefficient  of  form  =  .61 . 


Range. 

Angle  of  depar- 
ture =  angle  of 
elevation  plus 
jump. 

Angle 

of  fall. 

Time  of  flight. 

Striking 
velocity. 

Drift. 

Danger 

sp;ice  for 
a  target  20 
feet  high. 

Maximum 

ordinate. 

Penetration 
ofharveyized 
armor  with 
capped  pro- 
jectiles. 

Change  of 
range  for 
variation  of 
±  HO  foot- 
seconds  initial 
velocity. 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

Yards. 

• 

' 

• 

Seconds. 

Fool-seconds. 

Yards. 

Yards. 

Feet. 

Inches. 

Yards. 

12,  000 

6 

13.5 

8 

19 

16.76 

1,746 

49.9 

46 

1,133 

14.1 

331 

12,  100 

6 

17.7 

8 

25 

16.94 

1,740 

51.0 

45 

1,  157 

14.0 

333 

12,  200 

6 

21.9 

8 

32 

17.  11 

'  1,  734 

52.  1 

45 

1,  181 

14.0 

335  , 

12,  300 

6 

26.1 

8 

39 

17.29 

1,728 

53.2 

44 

1,205 

13.9 

337  ! 

12,  400 

6 

30.3 

8 

46 

17.46 

1,723 

54.3 

44 

1,230 

13.9 

339 

12,  500 

6 

34.6 

8 

53 

17.64 

1,717 

55.4 

43 

1,255 

13.8 

341 

12,  600 

6 

38.9 

9 

00 

17.81 

1,711 

56.6 

42 

1,281 

13.7 

343 

12,  700 

6 

43.2 

9 

07 

17.99 

1,706 

57.8 

42 

1,  307 

13.7 

345 

12,  800 

6 

47.5 

9 

14 

18.  17 

1,700 

59.0 

41 

1,  333 

13.6 

347 

12,  900 

6 

51.8 

9 

21 

18.35 

1,695 

60.2 

41 

1,359 

13.6 

349 

13,  000 

6 

56.2 

9 

29 

18.  53 

1,689 

61.4 

40 

1,386 

13.5 

351 

13,  100 

7 

00.6 

9 

36 

18.71 

1,683 

62.6 

39 

1,413 

13.4 

353 

1.3,  200 

7 

05.0 

9 

44 

18.89 

1,678 

63.9 

39 

1,441 

13.4 

355 

13,  300 

7 

09.4 

9 

51 

19.07 

1,672 

65.2 

38 

1,469 

13.3 

357 

13,  400 

7 

13.9 

9 

59 

19.25 

1,667 

66.5 

38 

1,497 

13.3 

359 

13,  500 

7 

18.4 

10 

06 

19.44 

1,661 

67.8 

38 

1,526 

13.2 

361 

19 


RANGE  TABLE  FOR   12-INCH   GUN. 


Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2, 7  CO  foot-seconds. 

Coefficient  of  form  =  .61 . 


Change  of 
range  for 

variation  of 

±  10  pomi'ls 

in  weight  of 

projectile. 

Change  of 
range  for 
variation  of 
density  of 
air  of  ±  10 
per  cent. 

Change  of 
range  for 
wind  com- 
ponent in 
plane  of  fire 
of  12  knots. 

Change  of 

range  for 

motion  of 

gun  in  plane 

of  fire  of  12 

knots. 

Change  of 
range  for 
motion  of 
target  in 
plane  of  fire 
of  12  knots. 

Deviation 
for  lateral 
wind  com- 
ponent of  12 

knots. 

Deviation 
for  lateral 
motion  of 
gun  per- 
pendicular 
to  line  of  fire, 
speed  of  12 
knots. 

Deviation 
for  lateral 
motion  of 
target  per- 
pendicular 
to  line  of  fire, 
speed  of  12 
knots. 

Change  in 
height  of 
impact  for 
variation  of 
±  100  yards 
in  sight  bar. 

11 

12 

13 

14 

15 

16 

17 

18 

19 

20 

)''irds. 

Yards. 

yards. 

Yards. 

Yards. 

Yards. 

Yards. 

Yards. 

Feet. 

39 

306 

42 

70 

113 

22 

90 

113 

43 

39 

311 

43 

71 

114 

22 

91 

114 

44 

39 

315 

44 

71 

115 

23 

92 

115 

44 

38 

320 

44 

72 

116 

23 

92 

116 

45 

38 

324 

45 

72 

117 

24 

93 

117 

45 

38 

329 

46 

73 

119 

24 

94 

119 

46 

38 

334 

47 

73 

120 

24 

95 

120 

47 

38 

339 

48 

74 

121 

25 

96 

121 

48 

38 

343 

48 

74 

122 

25 

96 

122 

48 

38 

348 

49 

75 

123 

26 

97 

123 

49 

38 

353 

50 

75 

125 

26 

98 

125 

50 

38 

358 

51 

75 

126 

27 

99 

126 

51 

38 

363 

51 

76 

127 

27 

100 

127 

51 

37 

"368 

52 

76 

128 

28 

100 

128 

52 

37 

373 

52 

77 

129 

28 

101 

129 

52 

37 

378 

53 

77 

131 

29 

102 

131 

53 

20 


RANGE  TABLE  FOR   12-INCH   GUN. 


Weight  of  projectile  for  which  this  table  is  calculated,  870  'pounds.     Initial  velocity,  2, 7  00  foot-seconds. 

Coefficient  of  form  =  .61 . 


Range. 


Yards. 

13,  500 

13,  600 
13,  700 
13,  800 

13,  900 

14,  000 

14, 100 
14,  200 
14,  300 
14,  400 


Anele  of  depar- 

&«S$Su°J     An,leoffall.|Tiraeofflight.|      SWHgS 
jump. 


7     18.4  !  10 


'  Seconds. 

06  I     19.44 


7     22.9  I  10     14  I     19.62 


7     27.4  I  10  21 

! 

7     31.9  j  10  29 

7     36.5  |  10  36 

7     41.  1      10  44 


7  45.7 

7  50.3 

7  55.0 

7  59.7 


14,500  i     8     04.4 


10  51 

10  59 

11  07 
11  15 
11  23 


14,700  j  8  13.9  11  39 

14,800  |  8  18.7  11  47 

14,900  ;  8  23.5  11  56 

15,000  ;  8  28.3  12  04 


19.81 
19.99 
20.18 
20.36 


20.92 
21.  11 
21.30 


14,600        8     09.  1   j  11     31  I     21.49 


21.68 
21.87 
22.06 
22.26 


Foot-seconds. 

1,661 


20.55        1 
20. 73        1 


639 
634 


Drift. 


6 

Yards. 
67.8 


656  69.1 
650  70. 5 
645       71.9 


73.3 
74.7 


629  j  76.1 

624  '  77.6 

619  79.  1 

614  |  80.6 

609  82.  1 

604  83. 6 

600  85.  1 

595  86.7 

591  88.3 

586  i  89.9 


1     Danger 
space  for 
a  target  20 
feet  high. 

Maximum 
ordinate. 

7 

8 

Yards. 

Feet. 

38 

1,526  ! 

37 

1,555 

37 

1,585 

36. 

1,615 

36 

1,645 

35 

1,676 

34 

1,707 

34 

1,739 

33 

1,771 

33 

1,803 

33 

1,836 

32 

1,869 

32 

1,903 

31 

1,937 

31 

1,971 

31 

2,006 

Penetration 
ofharveyized 
armor  with 
capped  pro- 
jectiles. 


B 


Inches. 

13.2 

13.2 
13.1 
13.1 
13.0 
13.0 

12.9 
12.9 
12.8 
12.8 
12.7 

12.6 
12.6 
12.5 
12.5 
12.5 


Change  of 
range  for 
variation  of 
±  50  foot- 
seconds  initial 
velocity. 


10 


Yards. 

361 

363 
365 
367 
369 
371 

373 
375 
377 
379 
381 

383 
385 
387 
389 
391 


21 


RANGE  TABLE  FOR  12-INCH   GUN. 


Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2, 700  foot-seconds. 

Coefficient  of  form  =  .61 . 


Change  of 

range  for 

variation  of 

±  10  pounds 

in  weight  of 

projectile. 


Change  of 
ranee  for 
variation  of 
density  of 
air  of  ±  10 
per  cent. 


12 


Fords. 

Yards. 

37 

378 

37 

383 

37 

388 

37 

393 

37 

398 

37 

403 

Change  of  Change  of 

range  for  range  for 

wind  com-  motion  of 

ponent  in  gnn  in  plane 

plane  of  fire  of  fire  of  12 

of  12  knots.  knots. 


13 


Yards. 

53 

54 
55 
55 
56 
57 


Change  of 
range  for 
motion  of 

•fSSffl' 

of  12  knots. 


Deviation 
for  lateral 
wind  corn- 


knots. 


14 


Yards. 

77 

78 
78 
79 
79 
80 


15 


Yards. 

131  ! 

132 
133  | 
134 
135 
137 


16 


Yards. 

29 

29 
30 
30 
31 
31 


Deviation 
for  lateral 
motion  of 
gun  per- 
pendicular 
to  line  of  fire, 
speed  of  12 
knots. 

17 


Deviation 
for  lateral 
motion  of 
target  per- 
pendicular 
to  line  of  fire, 
speed  of  12 
knots. 

18 


Yards. 

102 

103 
104 
104 
105 
106 


Yards. 

131 

132 
133 
134 
135 
137 


Change  in 
height  of 
impact  for 
variation  of 
±  100  yards 
in  sight  bar. 


19 


Feet. 


53 

54 
54 
55 
55 
56 


37 
37 
36 
36 
36 


408 
413 
419 
424 
429 


58 
59 
59 
60 
61 


80 
81 
81 
82 

82 


138 
139 
141 
142 
143 


31  ! 

32 

32 

33 

33 


107 
107 
108 
108 
109 


138 
139 
141 
142 
143 


57 
58 
58 
59 
60 


36 

36 
35 
35 
35 


434 
439 
445 
450 
455 


62 
63 
63 
64 
65 


82 
83 
83 

84 
84 


144 
146 
147 
149 
150 


34 
34 
35 
35  ! 
36 


110 
111 
111 
112 
113 


144 
146 
147 
149 
150 


61 
62 
62 
63 
64 


22 


RANGE  TABLE  FOR  12-INCH   GUN. 


Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.  .  Initial  velocity,  2, ? '00 foot-seconds. 

Coefficient  of  form  =  .61 . 


Range. 

Angle  of  depar- 
ture =  angle  of 
elevation  plus 
jump. 

Angle  of  fall. 

Time  of  flight. 

Striking 
velocity. 

Drift. 

Danger 
space  for 
a  target  20 
feet  high. 

Maximum 
ordinate. 

Penetration 
ofharveyized 
armor  with 
capped  pro- 
jectiles. 

i 

Change  of 
range  for 
variation  of 
±  50  foot- 
seconds  initial 
velocity. 

1 

2 

i 

4 

5 

6 

7 

8 

» 

10 

Yards. 

' 

• 

' 

Seconds. 

Foot-seconds. 

Yards. 

Yards. 

Feet. 

Inches. 

Yards. 

15,  000 

8 

28.3 

12 

04 

22.26 

1,586 

89.9 

31 

2,006 

12.5 

391 

15,  100 

8 

33.2 

12 

13 

22.45 

1,581 

91.5 

30 

2,041 

12.4 

393 

15,  200 

8 

38.1 

12 

21 

22.65 

1,577 

93.1 

30 

2,077 

12.4 

395 

15,  300 

8 

43.0 

12 

30 

22.84 

1,572 

94.8 

29 

2,113 

12.3 

397 

15,  400 

8 

47.9 

12 

38 

23.04 

1,568 

96.5 

29 

2,149 

12.3 

399 

15,  500 

8 

52.8 

12 

47 

23.23 

1,563 

98.2 

29 

2,186 

12.3 

401 

15,  600 

8 

57.8 

12 

55 

23.43 

1,559 

100.0 

28 

2,223 

12.2 

403 

15,  700 

9 

02.8 

13 

04 

23.62 

1,554 

101.8 

28 

2,261 

12.1 

405 

15,  800 

9 

07.8 

13 

13 

23.82 

1,550 

103.6 

27 

2,299 

12.1 

407 

15,  900 

9 

12.8 

13 

22 

24.02 

1,545 

105.4 

27 

2,337 

12.0 

409 

16,  000 

9 

17.9 

13 

31 

24.22 

1,541 

107.  2 

27 

2,376 

12.0 

411 

16,  100 

9 

23.0 

13 

40 

24.42 

1,537 

109.1 

26 

2,415 

11.9 

413 

16,  200 

9 

28.1 

13 

49 

24.62 

1,532 

111.0 

26 

2,455 

11.9 

415 

16,  300 

9 

33.2 

13 

58 

24.82 

1,528 

112.9 

26 

2,495 

11.8 

417 

16,  400 

9 

38.3 

14 

07 

25.02 

1,523 

114.8 

26 

2,535 

11.8 

419 

16,  500 

9 

43.5 

14 

16 

25.23 

1,519 

116.7 

26 

2,576 

11.8 

421 

23 


RANGE  TABLE  FOR  12-INCH   GUN. 

Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2, 7  00  foot-seconds . 

Coefficient  of  form  =  .61 . 


Change  of 
range  for 


Change  of 
range  for 


variation  of  variation  of 

±  10  pounds  density  of 

in  weight  of  air  of  ±10 

projectile.  per  cent. 


11 


Yards. 


35 

35 
35 
34 
34 
34 

34 
34 
33 
33 
33 

33 
33 
32 
32 
32 


12 


Change  of 
range  for 
wind  com- 
ponent in 
plane  of  hre 
of  12  knots. 


18 


Change  of 
range  for 
motion  of 
gun  in  plane 
of  fire  of  12 
knots. 


14 


Change  of 
range  for 
motion  of 
target  in 
plane  of  tire 
of  12  knots. 


Deviation 
for  lateral 
wind  com- 
ponent of  12 
knots. 


Yards. 

455 

460 
465 
471 
476 
481 

486 
492 
497 
503 
508 

514 
519 
525 
530 
536 


Yards. 

65 

66 
67 
68 
69 
70 

71 
72 
73 

74 
75 

76 

77 
78 
79 
80 


Yards. 

84 

84 
85 
85 
86 
86 

86 

87 
87 
88 
88 

88 
89 
89 
90 
90 


Deviation  Deviation 

for  lateral  i  for  lateral  Change  in 

motion  of  -  motion  of  height  of 

gun  per-  ,  target  per-  i    impact  for 

pendicular  j  pendicular  I  variation  of 

to  line  of  nre, '  to  line  of  nre,  j  ±  100  yards 

speed  of  12  j  speed  of  12  '  in  sight  bar. 

knots.  knots. 


15 

Yards. 

150 

151 
152 
154 
155 
156 

157 
159 
160 
162 
163 

164 
166 
167 
169 
170 


16 


Fords. 

36 

37 
37 
38 
38 
39 

39 
40 
40 
41 
41 

42 
42 
43 
43 
44 


17 


Yards. 

113 

114 
115 
115 
116 
117 

118 
119 
119 
120 
121 

122 
123 
123 
124 
125 


18 


19 


Yards. 

150 

151 
152 
154 
155 
156 

157 
159 
160 
162 
163 

164 
166 
167 
169 
170 


Feet. 


64 

65 
66 
66 
67 
68 

69 
70 
70 
71 
72 

73 
74 
74 
75 
76 


24 


RANGE  TABLE  FOR  12-INCH  GUN. 


Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.  .  Initial  velocity,  2, 700 foot-seconds. 

Coefficient  of  form  =  .61. 


Kange. 

Angle  of  depar- 
ture =  angle  of 
elevation  plus 
jump. 

Angle 

of  fall. 

Time  of  flight. 

Striking 
velocity. 

Drift. 

Danger 
space  for 
a  target  20 
feet  high. 

Maximum 
ordinate. 

Penetration 
ofharveyized 
armor  with 
capped  pro- 
jectiles. 

Change  of 
range  for 
variation  of 
±  50  foot- 
seconds  initial 
velocity. 

1 

2 

3 

4 

5 

6 

7 

8 

9 

10 

Yards. 

' 

• 

Seconds. 

Foot-seconds. 

Yards. 

Yards. 

Feet. 

Inches. 

Yards. 

16,  500 

9 

43.5 

14 

16 

25.23 

1,519 

116.7 

26 

2,576 

11.8 

421 

16,  600 

9 

48.7 

14 

25 

25.43 

1,515 

118.7 

25 

2,617 

11.7 

423 

16,  700 

9 

53.9 

14 

34 

25.64 

1,511 

120.7 

25 

2,659 

11.7 

425 

16,800 

9 

59.1 

14 

43 

25.84 

1,507 

122.7 

25 

2,701 

11.6 

426  i 

16,  900 

10 

04.4 

14 

53 

26.05 

1,503 

124.7 

25 

2,744 

11.6 

428 

17,  000 

10 

09.7 

15 

02 

26.25 

1,499 

126.8 

25 

2,787 

11.6 

430 

17,  100 

10 

15.0 

15 

12 

26.46 

1,495 

128.9 

24 

2,831 

11.5 

432 

17,  200 

10 

20.3 

15 

21 

26.66 

1,491 

131.0 

24 

2,875 

11.5 

434 

17,300 

10 

25.6 

15 

31 

26.87 

1,487 

133.1 

24 

2,920 

11.4 

435 

17,  400 

10 

31.0 

15 

40 

27.07 

1,483 

135.3 

24 

2,965 

11.4 

437 

17,  500 

10 

36.4 

15 

50 

27.28 

1,479 

137.5 

24 

3,010 

11.4 

439 

17,600 

10 

41.8 

16 

00 

27.48 

1,475 

139.7 

23 

3,056 

11.3 

441 

17, 700 

10 

47.2 

16 

09 

27.69 

1,471 

142.0 

23 

3,103 

11.3 

442   , 

17,  800 

10 

52.6 

16 

19 

27.90 

1,467 

144.  3 

23 

3,150 

11.3 

444 

17,  900 

10 

58.0 

16 

28 

28.11 

1,464 

146.6 

23 

3,198 

11.2 

445 

18,  000 

11 

03.5 

16 

38 

28.32 

1,460 

149.0 

23 

3,246 

11.2 

447  \ 

25 


RANGE  TABLE  FOR  12-INCH   GUN. 

Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2,700  foot-seconds. 

Coefficient  of  form  =  .61 . 


Change  of 

ran  ye  for 

variation  of 

±  10  pounds 

in  weight  of 

projectile. 


Change  of 
range  for 
variation  of 
density  of 
air  of  ±  10 
per  cent. 


12 


Change  of 
range  for 
wind  com- 
ponent in 
plane  of  fire 
of  12  knots. 


13 


Yards. 


32 

32 
32 
31 
31 
31 


Yards. 

536 

542 
547 
553 
558 
564 


Change  of 

range  for 

motion  of 

gun  in  plane 

of  fire  of  12 

knots. 


14 


Yards. 

80 

81 

82 
82 
83 
84 


31 

570 

85 

31 

575 

86 

30 

581 

87 

30 

586 

88 

30 

592 

89 

30 

598 

90 

29 

603 

91 

29 

609 

92 

28 

614 

93 

28 

620 

94 

Change  of 
range  for 
motion  of 
target  In 
plane  of  fire 
of  12  knots. 


15 


Yards. 

90 

90 
91 
91 
92 
92 

93 
93 
94 
94 
95 

95 
96 
96 
97 
97 


Deviation 
for  lateral 
wind  com- 
ponent of  12 
knots. 


16 


Yards. 

170 

171 
173 
174 
176 
177 

178 
180 
181 
183 
184 

185 
187 
188 
190 
191 


Yards. 

44 

45 
45 
46 
46 
47 

48 
48 
49 
49 
50 

51 
51 
52 
52 
53 


Deviation 
for  lateral 
motion  of 
gun  per- 
pendicular 
to  line  of  fire, 
speed  of  12 
knots. 

17 


Yards. 

125 

126 
127 
127 
128 
129 

130 
131 
131 
132 
133 

134 
135 
135 
136 
137 


Deviation 
for  lateral 
motion  of 
target  per- 
pendicular 
to  line  of  fire, 
speed  of  12 
knots. 

18 


Change  in 
height  of 
impact  for 
variation  of 
±  100  yards 
In  sight  bar. 


19 


Yards. 

170 

171 
173 
174 
176 
177 

178 
180 
181 
183 
184 

185 
187 
188 
190 
191 


Feet. 


76 

77 
78 
78 
79 
80 

81 
82 
83 

84 

85 

86  j 

87 

87 

88 

89 


20 


26 


RANGE  TABLE  FOR  12-INCH   GUN. 


Weight  of -projectile  for  which  this  table  is  calculated,  870  pounds.  '  Initial  velocity,  2, 7  00  foot-seconds. 

Coefficient  of  form  =  .61 . 


Range. 

Angle  of  depar- 
ture =  angle  of 
elevation  plus 
jump. 

Angle  of  fall. 

Time  of  flight. 

Striking 
velocity. 

Drift. 

Danger 

spa~e  for 
a  target  20 
feet  high. 

Maximum 
ordinate. 

Penetration 
ofharveyized 
armor  with 
capped  pro- 
jectiles. 

Change  of 
range  for 
variation  of 
±  50  foot- 
seconds  initial 
velocity. 

1 

2 

3 

4 

5 

. 

6 

7 

8 

9 

10 

Yards. 

o                          / 

• 

/ 

Seconds. 

Foot-seconds. 

Yards. 

Yards. 

Feet. 

Inches. 

Yards. 

18,  000 

11     03.5 

16 

38 

28.32 

1,460 

149.0 

23 

3,246 

11.2 

447 

18, 100 

11     09.0 

16 

48 

28.53 

1,457 

151.4 

22 

3,295 

11.2 

449 

18,  200 

11     14.5 

16 

58 

28.74 

1,453 

153.8 

22 

3,345 

11.1 

450 

18,  300 

11     20.0 

17 

08 

28.95 

1,450 

156.2 

22 

3,395 

11.1 

452 

18,  400 

11     25.5 

17 

18 

29.17 

1,446 

158.7 

22 

3,445 

11.1 

453 

18,  500 

11     31.1 

17 

28 

29.38 

1,443 

161.2 

22 

3,496 

11.1 

455 

18,  600 

11     36.7 

17 

38 

29.60 

1,439 

163.7 

21 

3,547 

11.0 

457  i 

18,  700 

11     42.3 

17 

48 

29.81 

1,436 

166.3 

21 

3,599 

11.0 

458 

18,  800 

11     48.0 

17 

58 

30.03 

1,433 

168.9 

21 

3,652 

10.9 

460 

18,  900 

11     53.7 

18 

08 

30.24 

1,430 

171.5 

21 

3,706 

10.9 

461 

19,  000 

11     59.4 

18 

18 

30.  46 

1,427 

174.1 

21 

3,760 

10.9 

463 

19, 100 

12     05.1 

18 

28 

30.67 

1,424 

176.8 

20 

3,815 

10.8 

465 

19,200 

12     10.8 

18 

39 

30.89 

1,421 

179.5 

20 

3,870 

10.8 

466 

19,  300 

12     16.6 

18 

49 

31.11 

1,418 

182.2 

20 

3,926 

10.8 

468  j 

19,  400 

12     22.4 

19 

00 

31.33 

1,416 

185.0 

20 

3,982 

10.8 

469 

19,  500 

12     28.2 

19 

10 

31.55 

1,413 

187.8 

20 

4,038 

10.8 

471 

27 


RANGE  TABLE  FOR  12-INCH   GUN. 


Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2, 700  foot-seconds 

Coefficient  of  form  =  .61 . 


Change  of 
range  for 
variation  of 
±  10  pounds 
in  weight  of 
projectile. 


11 


Change  of 
range  for 
variation  of 
density  of 
air  of  ±  10 
per  cent. 


12 


Yards. 

Ford*. 

28 

620 

28 

626 

28 

631 

27 

637 

27 

642 

27 

648 

27 
26 
26 
25 
25 

25 
25 
24 
24 
24 


654 
659 
665 
670 
676 

682 
688 
693 
699 
705 


Change  of 
range  for 
wind  com- 
ponent in 
plane  of  fire 
of  12  knots. 


13 

Yards. 

94 

95 
96 
97 
98 
99 

100 
101 
102 
103 
104 

105 

106 
107 
108 
110 


Change  of 
range  for 
motion  of 
gun  in  plane 
of  fire  of  12 
knots. 


14 

Yards. 

97 


97 

98 
98 
99 
99 

99 
100 
100 
101 
101 

101 
102 
102 
103 
103 


Change  of 
range  for 
motion  of 
target  in 
plane  of  fire 
of  12  knots. 


15 

Yards. 

191 


Deviation 
for  lateral 
wind  corn- 


Deviation 
for  lateral 
motion  of 
gun  per- 
pendicular 


Deviation 
for  lateral 
motion  of 
target  per- 
pendicular 


Change  in 
height  of 
impact  for 
variation  of 


Vnnts  t0  line  of  lire>  ! t0  line  of  fire>  !  ±  10°  >'arls 


192 
194 
195 
197 
198 

199 
201 
202 
204 
205 

207  i 

208  ! 
210  | 
211 
213 


knots 


16 


speed  of  12 
knots. 


17 


speed  of  12      in  sight  bar. 
knots. 


18 


19 


Yards. 

53 

54 
54 
55 
55 
56 

57 

57 
58 
58 
59 

60 
61 
61 
62 
63 


Yards. 

137 

138 
139 
139 

140 
141 

142 
143 
143 
144 
145 

146 
147 
147 
148 
149 


Yards. 

191 

192 
194 
195 
197 
198 

199 
201 
202 
204 
205 

207 
208 
210 
211 
213 


Feet. 


89 

90 
91 
92 
93 
94 

95 
96 
97 
98 
99 

100 
101 
102 
103 
104 


28 


RANGE  TABLE  FOR  12-INCH  GUN. 

Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.  •  Initial  velocity,  2, 7  00  foot-seconds , 

Coefficient  of  form  =  .61 . 


Range. 


Yards. 

19,  500 

19,  600 
19,  700 
19,  800 

19,  900 

20,  000 

20,  100 
20,  200 
20,  300 
20,  400 
20,  500 

20,  600 
20,  700 
20,  800 

20,  900 

21,  000 


Angle  of  depar- 
ture =  angle  of 
elevation  plus 
jump. 


12     28.2 


13     33.3 


Angle  of  fall.  JTime  of  flight  .j     JtgJJg* 


Danger 


Penetration        Change  of 
ranK'e  for 


12 

34.0 

19 

20 

12 

39.8 

19 

31 

12 

45.7 

19 

41 

12 

51.6 

19 

52 

12 

57.5 

20 

02 

13 

03.4 

20 

12 

13 

09.3 

20 

23 

13 

15.3 

20 

34 

13 

21.3 

20 

45 

13 

27.3 

20 

56 

19  10 


21  06 


13  39.4  |  21  17 

13  45.5  i  21  28 

13  51.6  21  39 

13  57.7  21  50 


Seconds. 

31.55 

31.77 
31.99 
32.21 
32.43 
32.66 

32.88 
33.11 
33.33 
33.56 
33.78 

34.01 
34.23 
34.46 
34.68 
34.91 


Foot-seconds. 

1,413 

1,410 
1,408 
1,405 
1,403 
1,400 

1,398 
1,395 
1,393 
1,390 
1,388 

1,385 
1,383 
1,381 
1,379 
1,377 


Drift. 

6 

Yards. 

187.8 


ranger  of  harvevi?.-.]         ranw  lor 

spaeefor    j    Maximum    i  aFrnw  witlT    variation  of 


a  target  20       ordinate 
feet  high 


•s 


227.5 
230.8  | 
234.2  i 


Yards. 

20 


190.7 

19 

193.6 

19 

196.5 

19 

199.4 

19 

202.4 

19 

205.4 

18 

208.5 

18 

211.6 

18 

214.7 

18 

217.8 

18 

221.0 

17 

224.2 

17 

17 
17 
17 


CaPP?n  Pr°"  .se^ndstltial 


Feet. 

4,038 

4,095 
4,153 
4,211 
4,270 
4,330 

4,390 
4,451 
4,512 
4,574 
4,636 

4,699 
4,763 
4,827 
4,991 
4,956 


jectiles. 

9 

Inches. 

10.8 


velocity. 
10 


Yards. 

471 


10.7 

473 

10.7 

474 

10.7 

476 

10.7 

477 

10.7 

479 

10.6 

481 

10.6 

482 

10.6 

484 

10.6 

485 

10.6 

487 

10.5 

489 

10.5 

490 

10.5 

492 

10.5 

493  ! 

10.5 

495 

_jy 


RANGE  TABLE  FOR  12-INCH  GUN. 


Weight  of  projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2, 700 foot-seconds. 

Coefficient  of  form  =  .61 . 


Change  of 

ranee  for 

variation  of 

±  10  pounds 

in  weight  of 

projectile. 


11 


Yards. 

24 

24 
24 
23 
23 
23 

23 
23 
22 
22 
22 


Change  of 
range  for 
variation  of 
density  of 
air  of  ±  10 
per  cent. 


12 


Change  of 
range  for 
wind  com- 
ponent in 
plane  of  fire 
of  12  knots. 


13 


Yards. 
705 

711 

717 
722 

728 
734 

740 
746 
751 
757 
763 


22 

769 

21 

775 

21 

780 

20 

786 

20 

792 

Yards. 

110 

111 

112 
113 
114 
115 

116 
117 
118 
119 
121 

122 
123 
124 
125 
127 


Change  of 
range  for 
motion  of 
gun  in  plane 
of  fire  of  12 
knots. 


14 

yard*. 

103 

103 
104 
104 
105 
105 

105 
106 
106 
107 
107 

107 
108 
108 
109 
109 


Change  of 
range  for 
motion  of 
target  in 
plane  of  fire 
of  12  knots. 


15 

Yards. 

213 


Deviation 
for  lateral 
wind  com- 
ponent of  12 
knots. 


16 

Yards. 

63 


Deviation 
for  lateral 
motion  of 
gun  per- 
pendicular 
to  line  of  lire, 
speed  of  12 
knots. 
•     i 
17 


Yards. 

149 


214 
216 
217 
219 
220 

222 
223 
225 
226 
228 

229 
231 
232 
234 
235 


64 
64 
65 
65 
66 

67 
67 
68 
68 
69 

70 
71 
71 
72 
73 


150 
151 
152 
153 
154 

155 

156 
156 
157 
158 

159 
160 
160 
161 
162 


Deviation 
for  lateral 
motion  of 
target  per- 
pendicular 
to  line  of  fire 
speed  of  12 
knots. 

18 


Yards. 

213 


Change  in 
height  of 

impact  for 
variation  of 
±  100  yards 
in  sight  bar. 


19 

Feel. 
104 


214  ! 
216  j 
217 
219 
220 

222 
223 
225 
226  ! 

228 

229  j 
231  ] 
232 

234  I 

235  i 


105 
106 
107 
108 
109 

110 
111 
112 
113 
114 

115 
116 
117 
118 
120 


30 


RANGE  TABLE  FOR   12-INCH   GUN. 


Weight  of 'projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2,700  foot-seconds. 

Coefficient  of  form  =  .61 . 


Range. 


I  Angle  of  depar- 
ture =  angle  of 
I    elevation  plus 
jump. 


Angle  of  fall.  jTime  of  flight.,      striking 


Drift. 


Yards. 

21.000 


21 
21 
21 
21 
21 

21 
21 
21 
21 
22 


13     57.7  I  21     50 


100 
200 
300 
400 
500 


Seconds. 

34.91 


14  03.8  I  22  00  |  35.14 

14  10.0  22  11  !  35.37 

14  16.2  22  22  j  35.60 

14  22.4  j  22  33  35.83 

14  28.6  j  22  44  i  36.06 


600  14  34.8  j  22  55  j  36.29 

700  14  41.1  !  23  06  36.52 

800  I  14  47.4  23  17  36.75 

900  j  14  53.7  j  23  28  !  36.98 

000  i  15  00.0  !  23  39  i  37.21 


Daneer  Penetration 

spacefor  Maximum     °l^^ 

a  target  20,  ordinate.       £S w'th 

feet  high.  CafePctUel 


Foot-seconds. 


Yards. 


1,377  i  234.2 


1,375 
1,373 


237.6 
241.0 


1,371  244.5  , 
1,369  248.0  ! 
1,367  I  251.5 


€:■ 


M 


1,365 
1,363 
1,361 
1,360 
1,359 

0 


255.1 
258.7 
262.4 
266.1 
269.8 


8 


it 


Yards.  Feet. 

17        4,956 


pTUr 


Inches. 

10.5 


Change  of 
range  for 
variation  of 
±  50  foot- 
seconds  initial 
velocity. 


10 


16  I  5,022  |  10.4 

16  I  5,088  !  10.4 

16  |  5,155  i  10.4 

16  5,222  |  10.4 

16  |  5,290  j  10.4 

15  j  5,359  i  10.3 

15  |  5,428  !  10.3 

15  5,498  i  10.3 

15  |  5,568  '  10.3 

15  5,638  10.3 


Yards. 

495 

497 
498 
500 
501 
503 

505 
506 
508 
509 
511 


i> 


31 


RANGE  TABLE  FOR  12-INCH  GUN. 


Weight  of 'projectile  for  which  this  table  is  calculated,  870  pounds.     Initial  velocity,  2, 7  00  foot-seconds . 

Coefficient  of  form  =  .61 . 


Change  of     1    Change  of 

range  for           range  for 

variation  of      variation  of 

±  10  pounds       density  of 

in  weight  of   '•    air  of  ±  10 

projectile,     j     percent. 

11                        12 

Change  of    1    Change  of 
range  for          range  for 
wind  com-        motion  of 
ponent  in      gun  in  plane 
plane  of  fire      of  fire  of  12 
of  12  knots.   !     '  knots. 

13           j           14 

I 

Change  of 
range  for 
motion  of 
target  in 
plane  of  fire 
of  12  knots. 

15 

'    Deviation 
Deviation    1     for  lateral 
foflaS    1    motion  of 
wind  com-    i     ^nPer- 
wnent  o?12      Pendieular 
knots        <  to  line  of  fire, 
Kuols-       ;   speed  of  12 
knots. 

16                     17 

Deviation 
for  lateral 
motion  of 
target  per- 
pendicular 
to  line  of  fire, 
speed  of  12 
knots. 

18 

Change  in 
height  of 
impact  for 
variation  of 
±  100  yards 
in  sight  bar. 

19 

20 

Yards. 

20 

20 
19 
19 
18 
18 

18 
17 
17 
16 
16 

Yards.               Yards. 

792            127 

798  ,         128 
804            129 
809            130 
815            131 
821            133 

827            134 
833            135 
838  '         136 
844            137 
850            139 

Fords. 

109 

109 
110 
110 
111 
111 

111 
112 
112 
113 
113 

Yards. 

235 

237 
238 
240 
241 
243 

245 
246 
248 
249 
251 

Yards.              Yards. 

73  162 

74  163 

74  164 

75  164 

75  165 

76  166 

77  167 

78  168 

78  168 

79  169 

80  170 

Yards. 

235 

237 
238 
240 
241 
243 

245 
246 
248 
249 
251 

Feet. 

120 

121 
122 
123 
124 
125 

126 
127 
128 
129 
131 



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